"This article outlines the comparative risk assessment approach and discusses its main advantages and limitations for its use in assessments of the health impacts of climate change at the national level. The comparative risk assessment method involves four stages: a) identifying health outcomes sensitive to climatic influences, b) quantifying the dose-response relationship for a baseline climate period, c) defining future exposure scenarios, and d) estimating the burden of disease that is attributable to a risk factor (i.e., relative to the risk if climate were unaffected by human actions) and the burden that is avoidable by plausible reductions in the risk factor. Each of these steps requires more detailed decisions, for example, selection between various possible scenarios for future greenhouse gas emissions and associated climate change, or between alternative models describing the relationships between climate and individual health outcomes."
Environmental Health Perspectives: http://www.ehponline.org/
Environmental Health Perspectives (December 2006) v.114 no.12, p. 1935 - 1941